September 1933

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Features

After 10,000 Years--a New Bee!

By Ruby M. Strickland

Latest Photographs from Persepolis

The Carolina Bays--are they Meteor Craters?--I

By F. A. Melton and William Schriever

A Request for Data on Apparitions

Our Second Test of Telepathy

Is Sexual Abstinence Harmful?

By Ignatius W. Cox

Learning to Use the Instrument

By Frank Challis and John F. Brandt

Where Astronomers when they Die

By Henry Norris Russell

The Lessons of 50,000,000 Miles of Flying

By Robert Johnson

A Real 'Electric Eye'

By A. P. Peck

"Mass Production" Welding

Flameless, Arcless Process Produces Thousands of Welds an Hour Under the Supervision of One Man

Checking Up on the Silkworm

By Grace Lockhart

The Amateur Astronomer, September 1933

By Albert G. Ingalls

Departments

Departments

Across the Editor's Desk, September 1933

Back of Frontispiece, September 1933

Giant Sculptures of Ancient Persia

Our Point of View, September 1933

Scientific American Prize Awards, Antitoxin and Scarlet Fever and more

Current Bulletin Briefs, September 1933

Books Selected by the Editors, September 1933

Beer and Liquor Trademarks, Trademark Cancelled and more

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Digital Issue ?Read or download this issue’s articles online. *A printed copy of this issue is not included. $7.99

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